Add loong64 support
Closes https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1107263.
Patches is necessary for loong64 support: https://github.com/intel/media-driver/pull/1936.
And add loong64 only build dep libsimde-dev.
Tested on Loongson 3A6000 with Intel Arc B580. Vaapi encoding/decoding works fine.